I never noticed it before. I was putting on my 18-55mm lens and noticed what looked like hand lotion on it. Then I noticed that there were three identical strips all the way around the mount. The only thing I can think of is this is some sort of lube. Does anyone know what it is? If it is...
I have a Industar 69. It's a great little pancake lens but it doesn't focus to infinity with the M39 adapter. The original camera it came with has a shorter registration distance than a normal M39 camera. Many people file down the lens to work. I rather try to make a smaller adapter. It...
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